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Comparison of two related (A) and unrelated (B) protein pairs at the secondary structure level. The sequence pairs of 1hbr-A/2vhb-B (A) and 1ai7/1jac (B) were aligned using the CLUSTALW (1.8) program (Thompson et al. 1994) with default parameters and their observed secondary structures were deduced from PDB files using the DSSP algorithm (Kabsch and Sander 1983). Helices are in thin light boxes, and sheets are in large dark boxes.
